Fuel Cell Stack Separator Positioning Mechanism
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Solution Overview
Problem
The assembly of fuel cell stacks becomes inefficient as the number of stacked unit cells increases, due to difficulties in accurately positioning separators, leading to positional deviations and compromised sealing functions.
Innovation Solution
A positioning mechanism with protruded portions and recesses on metal separators, made from resin materials, ensures accurate alignment and insulation between separators, reducing component count and assembly complexity, while preventing mistaken ordering through distinct shape and size differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If knock pins are inserted into positioning holes to align unit cells, then alignment accuracy is improved, but assembly efficiency deteriorates as the number of stacked unit cells increases
Solution Approach 1:
The invention extracts the positioning function from separate knock pins and integrates it directly into the separator structure through protruded portions and recesses. This eliminates the need for separate positioning components and simplifies the assembly process, allowing separators to self-align when stacked without requiring individual knock pin insertion for each unit cell.
Solution Approach 2:
The invention merges the positioning function with the separator structure by integrating protruded portions on one separator with corresponding recesses on adjacent separators. This combination creates a unified alignment system that works automatically during stacking, eliminating the need for separate positioning operations and improving assembly efficiency while maintaining alignment accuracy.
2Manufacturing precision
If multiple knock pins are used for positioning, then alignment accuracy is improved, but device complexity increases
Solution Approach 1:
The invention extracts the positioning function from separate knock pin components and embeds it directly into the separator structure. This reduces the total component count by eliminating standalone positioning elements while maintaining the alignment function through integrated protruded portions and recesses.
Solution Approach 2:
The invention combines the positioning function with the separator structure itself, creating a multi-functional component that serves both as a structural separator and as a positioning element. This merging reduces device complexity by eliminating the need for separate positioning components while ensuring accurate alignment through the integrated protruded portions and recesses.
3Reliability
If insulating positioning members are attached to separators, then insulation is improved, but device complexity increases
Solution Approach 1:
The invention merges the insulating function with the separator structure by making the protruded portions and recesses themselves from insulating material. This integration eliminates the need for separate insulating positioning members while maintaining both insulation and positioning functions, thereby reducing device complexity without compromising reliability.
Solution Approach 2:
The insulating portions of the separator structure serve multiple functions simultaneously: they provide electrical insulation between separators, provide positioning geometry through protruded portions and recesses, and maintain structural integrity. This multi-functionality reduces the need for separate components while improving reliability through integrated design.
Data Source
AI summary
A fuel cell stack has fuel cell units. Each of the fuel cell units includes first and second membrane electrode assemblies and first to third separators sandwiching the first and second membrane electrode assemblies. A positioning mechanism is used for positioning the first to third separators in alignment with each other. The positioning mechanism includes a first protruded portion and a second protruded portion. The first protruded portion protrudes from one surface of the second separator for positioning the first separator. The second protruded portion protrudes from the other surface of the second separator for positioning the third separator.